http://www.china-zjtk.com/core....-barrels-and-oversho
ChinaCoreBarrelsManufacturs Product Description The core barrel assembly lifts the drill core from the drill rod without picking up the drill bit. All tools include the main parts of drilling tools, overshots, drill pipes, jaws, round wrenches, etc. Their advantages are high penetration, high coring rate, long drill life, and low ab strength; and as the hole depth increases, the advantages are more obvious. Core barrel assembly is a device to take the
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